Improvement in saw-frames



' QHEN RY s; MILLER.`

lPatented May 30,1871.1

v'PEN HENRY s. M1LLEP.,oE PHILADELPHIA, PENNSYLVANIA, AssreNoEor oNE.

.HALF HISlRIGH'I TO SAMUEL H. DAVIS, JR., OF SAME PLACE. y

IMPRovEMENr IN sAwFRAMEs.

Specieation forming part of Letters Patent No. 115,'49, dated May 30, 1871.r

To all' whom it may concern:

. Be it known that I, HENRY S. MILLER, ot' the i ctyand county of Philadelphia and State of i Pennsylvania, have made new and useful Ini- .`provements in Saw-Frames; and I do hereby declare the following to be a clear and exact description of the nature thereof sufficient to enable others skilled in the art to which my invention `appertains to fully understand and `and use the same, reference being had to the accompanying drawing making part of this specification, in which- Figure l is a side view of the device illus trating my invention. Fig.2 is a similar view, partly in section. i

Similar letters of reference indicate sponding parts in the` two figures. i It is desirablein saw-frames that the saw be firmly strained but it is not desirable that such strain should b e of the nature called dead,7 or, in other words, without elasticity.

OOIT@- My invention consists in so forming theV stretchers of `the frame that, while the saw is` i uniformly strained, there issuflicient elasticity to the parts in order to lessen shocks to the frame and ease the tightening yoke or screw.

In the drawing, A and B represent the side pieces of the frame of a buck or other saw. G

is the saw-blade, and D the tightening-yoke; all of whichmay be of ordinary form and construction. E represents the upper s'tretchers, and F the lower stretchenjwhich latter, in the present case, consists of an arch secured to the side pieces of the-frame, and having its crown `facing upwaldf The stretchers E E consist of twopieces of curved form, their up- Yper ends being secured to the side pieces of the fram e. The lower ends rest on a box-plate,

@Gfwhich is secured to the corresponding stretcher, and operates directly downward against the lower arch.

When the yoke D is tightened the tops of `the stretchers E are brought together, and this forces down the crown oi the arch, thereby straining the saw.

yield in the longitudinal direction of the saw, and thus the nthrust against the lower stretcheriis not dead, but of an elastic nature.

All knots and other lobstacles to the sawblade will cause shocks to the saw-frame. This weakens the parts, works them loose, imparts shocks to the sawyer, and strains the threads of the screw of the tightening-yoke. All these objections are obviated or diminished by the curved arms or stretchers E. While said stretehers press directly downward on the lower stretcher they yield longitudinally, so that the frame istirrn and durable, yet sufficiently elastic to overcome the objections to airame where the parts are dead thrust against each other.

I am 4aware that stretchers have been applied to'saw-frames; and I am also aware that the upper stretchers have been formed of right-lined or straight pieces. I therefore make no claim thereto; but

I do claim- The saw-frame herein shown and described,

FFE.

In this operation the curved portion of the upper stretcher will 

